US20080261619A1 - Injection of location object into routing SIP message - Google Patents

Injection of location object into routing SIP message Download PDF

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US20080261619A1
US20080261619A1 US11/902,845 US90284507A US2008261619A1 US 20080261619 A1 US20080261619 A1 US 20080261619A1 US 90284507 A US90284507 A US 90284507A US 2008261619 A1 US2008261619 A1 US 2008261619A1
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location
sip
proxy
sip message
information based
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US11/902,845
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John Gordon Hines
Darrin Johnson
Jonathan A. Croy
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TeleCommunication Systems Inc
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Individual
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Publication of US20080261619A1 publication Critical patent/US20080261619A1/en
Assigned to SILICON VALLEY BANK, AGENT reassignment SILICON VALLEY BANK, AGENT SECURITY AGREEMENT Assignors: LONGHORN ACQUISITION, LLC, NETWORKS IN MOTION, INC., QUASAR ACQUISITION, LLC, SOLVERN INNOVATIONS, INC., TELECOMMUNICATION SYSTEMS, INC.
Assigned to TELECOMMUNICATION SYSTEMS, INC., LONGHORN ACQUISITION, LLC, NETWORKS IN MOTION, INC., QUASAR ACQUISITION, LLC, SOLVEM INNOVATIONS, INC. reassignment TELECOMMUNICATION SYSTEMS, INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: SILICON VALLEY BANK
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/30—Managing network names, e.g. use of aliases or nicknames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/51—Discovery or management thereof, e.g. service location protocol [SLP] or web services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/52—Network services specially adapted for the location of the user terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/029—Location-based management or tracking services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/30—Types of network names
    • H04L2101/385—Uniform resource identifier for session initiation protocol [SIP URI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2242/00—Special services or facilities
    • H04M2242/30—Determination of the location of a subscriber
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/42348—Location-based services which utilize the location information of a target
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1307—Call setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13103—Memory
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13141—Hunting for free outlet, circuit or channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13204—Protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13337—Picturephone, videotelephony
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13348—Channel/line reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13389—LAN, internet

Definitions

  • This invention relates generally to communications networks. More particularly, it relates to telecommunications networks including Voice Over Internet Protocol (VOIP) network communications, as well as to the provision of location based services (LBS).
  • VOIP Voice Over Internet Protocol
  • LBS location based services
  • Session Initiation Protocol is a basic protocol for initiating interactive communication sessions (e.g., voice, video, chat, interactive games, virtual reality, etc.) between users.
  • SIP Session Initiation Protocol
  • location of a particular wireless device is desired or required.
  • location and other caller-related data for the majority of calls is delivered or determined through multiple mechanisms. For instance, location and other data for the majority of calls is determined via the use of a unique query key (such as the telephone number or uniform resource identifier (URI)) to perform a database lookup.
  • a unique query key such as the telephone number or uniform resource identifier (URI)
  • URI uniform resource identifier
  • the unique query key e.g., telephone number or URI
  • the unique query key is used as a lookup element to query provisioned, staged or static information (e.g., from a suitable database) outside of the actual call signaling for location information.
  • FIG. 5 shows a conventional exemplary Voice over Internet Protocol (VOIP) based routing architecture for a given Session Initiation Protocol (SIP) message.
  • VOIP Voice over Internet Protocol
  • a Session Internet Protocol (SIP) message includes a unique query key, or location key (e.g., telephone number or URI) to be used to determine an action based on the initiator's location (i.e., position).
  • SIP Session Internet Protocol
  • location key e.g., telephone number or URI
  • the SIP message including the unique query (e.g., location) key is passed to a positioning center 502 .
  • the positioning center 502 uses the received location key to pass a query to an appropriate database 504 , e.g., a database associating static location with various location key information.
  • the static location database 504 determines the desired location information relating to the input location key, and returns the static location to the requesting positioning center 502 .
  • the positioning center 502 passes a request to another database, e.g., a routing database 506 , to obtain routing information associated with the received location information.
  • the routing database 506 outputs appropriate routing information to the requesting positioning center 502 .
  • the positioning center 502 passes on the SIP message together with new routing information obtained from the routing database 506 .
  • an entity that wants to route calls and perform other actions based on a caller's location must first build interfaces to the many disparate services and servers.
  • existing technology places the burden of determining and supporting multiple interfaces to various position determination technologies on all entities that want position information relating to a given caller.
  • a process for adding standard PIDF-LO data elements to SIP messages comprises receiving an inbound SIP message without location.
  • a SIP request without location is received from a VoIP capable device.
  • the SIP request contains messages indicating the type of location generator or service needed.
  • a Location Key like a Telephone Number or SIP URI
  • LO PIDF-LO
  • a method and apparatus for separating determination of location from gathering information based on determined location comprising receiving an incoming Session Internet Protocol (SIP) message at a location object proxy. A location of an initiator of the SIP message is determined. A location object is injected into the SIP message. The SIP message with location object (LO) is passed to a positioning center.
  • SIP Session Internet Protocol
  • FIG. 1A depicts the insertion of an LO Proxy to separate functions of determining location from the function of gathering information based on determined location, in accordance with the principles of the present invention.
  • FIG. 1B shows an exemplary embodiment of a location proxy architecture including a location proxy broker, which provides determination of a correct LO proxy for a given received SIP message, to handle emergency services requests, in accordance with the principles of the present invention.
  • FIG. 2 shows that after the location is added to the SIP message, any positioning center may be chosen to send the SIP Invite to.
  • FIG. 3 shows an exemplary VoIP based commercial architecture including location determination and the use of that location by an application program, in accordance with the principles of another embodiment of the invention.
  • FIG. 4 shows that after the location is added to the SIP message, the signaling may touch a number of applications depending on the initial requested service.
  • FIG. 5 shows a conventional exemplary Voice over Internet Protocol (VOIP) based routing architecture.
  • VOIP Voice over Internet Protocol
  • the present invention provides mechanisms for a mobile device's position to be added on the fly to a Session Initiation Protocol (SIP) message, providing a clearing house to add position to SIP regardless of the various technologies being used.
  • SIP Session Initiation Protocol
  • a process for adding standard PIDF-LO data elements to SIP messages comprises receiving an inbound SIP message without location.
  • a SIP request without location is received from a VoIP capable device.
  • the SIP request contains messages indicating the type of location generator or service needed.
  • a Location Key like a Telephone Number or SIP URI
  • LO PIDF-LO
  • the present invention reduces costs of implementation of downstream servers because those downstream servers need not then implement or learn interfacing with each of multiple position determination technologies.
  • location information is defined in the presence-based GEOPRIV location object format, which describes an object format for carrying geographical information on the Internet.
  • This location object extends the presence information data format (PIDF), which was designed for communicating privacy-sensitive presence information and which has similar properties.
  • PIDF-LO presence information data format location object
  • FIG. 1A depicts the insertion of an LO Proxy to separate functions of determining location from the function of gathering information based on determined location, in accordance with the principles of the present invention.
  • a location object (LO) proxy 100 and location generator 104 is inserted in a path between an incoming SIP message including a unique query key (e.g., a telephone number or uniform resource identifier (URI)) and a positioning center 150 .
  • a unique query key e.g., a telephone number or uniform resource identifier (URI)
  • location is queried by the location generator 104 instead of being a required function of the positioning center 150 .
  • the function of determination of location (handled by the location object (LO) proxy 100 and location generator 104 ) is separated from the function of gathering desired information to be used based on the determined location (e.g., routing instructions for 9-1-1 alls determined based on the determined location), handled by the positioning center 150 .
  • the location object (LO) proxy 100 attaches the location object (LO) to the request, and forwards the same to an appropriate positioning center 150 (e.g., a VoIP processing center (VPC)).
  • an appropriate positioning center 150 e.g., a VoIP processing center (VPC)
  • the disclosed embodiments provide that as new location determination systems or services are defined, only an appropriate location object (LO) proxy 100 need be implemented to receive and query those systems or services based on a unique set of information delivered specific to that location determination technology.
  • the location information system (LIS) as described above is one of those systems.
  • the LO proxy 100 receives a query key that is used by the LO proxy 100 to query a pre-provisioned database for the latitude and longitude of the provisioned address.
  • FIG. 1B shows an exemplary embodiment of a location proxy architecture including a location proxy broker, which provides determination of a correct LO proxy for a given received SIP message, to handle emergency services requests, in accordance with the principles of the present invention.
  • LO proxy broker (LOPB) 102 is inserted between the incoming SIP messages and the LO proxy 100 .
  • LBS location based services
  • the location object proxy broker (LOPB) 102 determines the appropriate LO proxy 100 to use (only one LO proxy is shown in FIG. 1B ).
  • the LO proxy 100 attaches a location object to the request (i.e., SIP with location key) and forwards the same to an engine (e.g., positioning center 150 ) that uses location to determine and return additional information (like routing information for a 911 call, routing information for commercial applications, etc).
  • a location object i.e., SIP with location key
  • an engine e.g., positioning center 150
  • the disclosed embodiments further provide that as new location determination systems or services are defined, data elements and the structure of that data in the initial SIP INVITE can be defined to query those systems or services for location information.
  • a location object (LO) proxy broker 102 is implemented in front of the LO proxy (or proxies) 100 .
  • the LO proxy broker 102 comprises logic (software and/or hardware) that enables it to evaluate the data elements and structure sent in the initial SIP INVITE to determine the appropriate LO Proxy 100 to send the INVITE to.
  • the Location Object (LO) proxy broker 102 acts like a router for a set of LO proxies 100 , where the data included in the messaging indicates to which LO proxy 100 the SIP INVITE should be sent.
  • LO Location Object
  • a User Endpoint initiates a SIP INVITE message including a unique location key (and/or other specific set of information in a predetermined location) in the SIP INVITE.
  • the INVITE is sent to the location object proxy broker (LOPB) 102 where the LOPB 102 evaluates key elements to determine which LO proxy 100 supports the technology to determine the location.
  • LOPB location object proxy broker
  • the LOPB 102 forwards the INVITE.
  • the LO proxy 100 receives the SIP INVITE from the LOPB 102 and uses key elements in the SIP INVITE to query a database, e.g., location database 504 , or service to determine location.
  • a database e.g., location database 504 , or service to determine location.
  • the LO proxy 100 Upon receipt of the location, the LO proxy 100 rewrites the SIP INVITE to include location.
  • the LO proxy 100 then forwards the SIP INVITE through the SIP network, presumably to an entity that will make use of the location.
  • UE user endpoint
  • VoIP Voice Over IP
  • a database e.g., a location information system
  • 911 or other designated emergency call number
  • the SIP INVITE from the VoIP phone will contain a unique key (the URI for example) that is forwarded on to the LOPB 102 .
  • the LOPB 102 evaluates the SIP message with the unique key (the caller URI for example) and determines that the SIP INVITE should be routed to the LO proxy (e.g., LO proxy 100 ) that handles location information system (LIS) requests using a URI.
  • the LO proxy e.g., LO proxy 100
  • LIS location information system
  • the LOPB 102 sends the SIP INVITE on to the location information system (LIS) LO proxy 100 .
  • the location information system (LIS) LO proxy 100 is a specific implementation of the LO proxy able to handle requests for LIS queries.
  • the LIS LO proxy 100 queries the LIS and receives location information back.
  • the SIP INVITE is rewritten with the location in a PIDF-LO in the SIP message, and is then forwarded on to a PDIF-LO enabled VoIP processing center (VPC) (e.g., positioning center 150 ) for determination of the appropriate emergency call center (e.g., appropriate Public Safety Access Point (PSAP) that the emergency call should be routed to.
  • VPC VoIP processing center
  • PSAP Public Safety Access Point
  • FIG. 2 shows that after the location is added to the SIP message, any positioning center may be chosen to send the SIP Invite to.
  • the SIP message with location object included may be forwarded to any (or all) of a plurality of appropriate positioning centers 150 a, 150 b.
  • FIG. 3 shows an exemplary VoIP based commercial architecture including location determination and the use of that location by an application program, in accordance with the principles of another embodiment of the invention.
  • the entity that handles the newly-separated secondary function of gathering information based on determined location is an application program 302 , including an associated application proxy 300 .
  • the application program 302 may be any desired application that utilizes location information received from the LO proxy 100 , e.g., in a SIP with location object (LO) message.
  • LO location object
  • FIG. 4 shows that after the location is added to the SIP message, the signaling may touch a number of applications depending on the initial requested service. For instance, as depicted in FIG. 4 , any number of application programs 302 a - 302 c (with associated application proxies 300 a - 300 c ) may receive the SIP with LO message packaged by the LO proxy 100 , in accordance with the principles of the present invention.
  • a location object proxy broker 102 in accordance with the principles of the invention separates location determination from instructions for call processing once location is determined. Also, the present invention enables a common presentation of location in SIP messaging for a location driven engine, examples being a VoIP Positioning Center (VPC) 150 or an application program 302 .
  • VPC VoIP Positioning Center
  • VoIP voice over IP
  • wireless and/or landline users as well as VoIP service providers.
  • VoIP service providers include any/all communications users, including voice over IP (VoIP), wireless and/or landline users, as well as VoIP service providers.
  • VoIP voice over IP
  • wireless and/or landline users as well as VoIP service providers.

Abstract

The function of determination of location is separated from the function of gathering information based on determined location by use of a Location Object (LO) proxy between an initiating VoIP capable device and a positioning center. The LOProxy queries an appropriate location database using a location key, and injects a PIDF-LO into a routing SIP message otherwise without location. A SIP request without location is received from a VoIP capable device. The SIP request contains messages indicating the type of location generator or service needed. A location key (like a telephone number or SIP URI), in addition to the type of location generator or service needed, is included in a SIP request. A location object (LO) broker may be used between a routing SIP message and a positioning center to direct a routing SIP message to an appropriate one of a plurality of location object (LO) proxies.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • This invention relates generally to communications networks. More particularly, it relates to telecommunications networks including Voice Over Internet Protocol (VOIP) network communications, as well as to the provision of location based services (LBS).
  • 2. Background of the Related Art
  • Session Initiation Protocol (SIP) is a basic protocol for initiating interactive communication sessions (e.g., voice, video, chat, interactive games, virtual reality, etc.) between users. In given SIP-based applications, location of a particular wireless device is desired or required.
  • Currently, location and other caller-related data for the majority of calls (VoIP, cellular, or landline) is delivered or determined through multiple mechanisms. For instance, location and other data for the majority of calls is determined via the use of a unique query key (such as the telephone number or uniform resource identifier (URI)) to perform a database lookup. In these architectures, the unique query key (e.g., telephone number or URI) is used as a lookup element to query provisioned, staged or static information (e.g., from a suitable database) outside of the actual call signaling for location information.
  • FIG. 5 shows a conventional exemplary Voice over Internet Protocol (VOIP) based routing architecture for a given Session Initiation Protocol (SIP) message.
  • In particular, as shown in FIG. 5, a Session Internet Protocol (SIP) message includes a unique query key, or location key (e.g., telephone number or URI) to be used to determine an action based on the initiator's location (i.e., position). As shown in FIG. 5, the SIP message including the unique query (e.g., location) key is passed to a positioning center 502.
  • Using the received location key, the positioning center 502 passes a query to an appropriate database 504, e.g., a database associating static location with various location key information. The static location database 504 determines the desired location information relating to the input location key, and returns the static location to the requesting positioning center 502.
  • Then, having obtained appropriate location information, the positioning center 502 passes a request to another database, e.g., a routing database 506, to obtain routing information associated with the received location information. The routing database 506 outputs appropriate routing information to the requesting positioning center 502. At that point, the positioning center 502 passes on the SIP message together with new routing information obtained from the routing database 506.
  • Accordingly, an entity that wants to route calls and perform other actions based on a caller's location must first build interfaces to the many disparate services and servers. Thus, existing technology places the burden of determining and supporting multiple interfaces to various position determination technologies on all entities that want position information relating to a given caller.
  • The present inventors have appreciated that such existing solutions make it cumbersome to un-bundle the two functions of (1) determining location; and (2) of gathering desired information to be used based on the determined location (e.g., routing instructions for 9-1-1 calls determined based on the determined location).
    • SUMMARY OF THE INVENTION
  • In accordance with the principles of the current invention, a process for adding standard PIDF-LO data elements to SIP messages comprises receiving an inbound SIP message without location. A SIP request without location is received from a VoIP capable device. The SIP request contains messages indicating the type of location generator or service needed. Using a Location Key (like a Telephone Number or SIP URI) in addition to the type of location generator or service needed, a PIDF-LO (LO) is added to the SIP request.
  • A method and apparatus for separating determination of location from gathering information based on determined location is provided, comprising receiving an incoming Session Internet Protocol (SIP) message at a location object proxy. A location of an initiator of the SIP message is determined. A location object is injected into the SIP message. The SIP message with location object (LO) is passed to a positioning center.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Features and advantages of the present invention will become apparent to those skilled in the art from the following description with reference to the drawings which:
  • FIG. 1A depicts the insertion of an LO Proxy to separate functions of determining location from the function of gathering information based on determined location, in accordance with the principles of the present invention.
  • FIG. 1B shows an exemplary embodiment of a location proxy architecture including a location proxy broker, which provides determination of a correct LO proxy for a given received SIP message, to handle emergency services requests, in accordance with the principles of the present invention.
  • FIG. 2 shows that after the location is added to the SIP message, any positioning center may be chosen to send the SIP Invite to.
  • FIG. 3 shows an exemplary VoIP based commercial architecture including location determination and the use of that location by an application program, in accordance with the principles of another embodiment of the invention.
  • FIG. 4 shows that after the location is added to the SIP message, the signaling may touch a number of applications depending on the initial requested service.
  • FIG. 5 shows a conventional exemplary Voice over Internet Protocol (VOIP) based routing architecture.
    •  DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
  • The present invention provides mechanisms for a mobile device's position to be added on the fly to a Session Initiation Protocol (SIP) message, providing a clearing house to add position to SIP regardless of the various technologies being used.
  • More particularly, in accordance with the principles of the current invention, a process for adding standard PIDF-LO data elements to SIP messages comprises receiving an inbound SIP message without location. A SIP request without location is received from a VoIP capable device. The SIP request contains messages indicating the type of location generator or service needed. Using a Location Key (like a Telephone Number or SIP URI) in addition to the type of location generator or service needed, a PIDF-LO (LO) is added to the SIP request.
  • The present invention reduces costs of implementation of downstream servers because those downstream servers need not then implement or reinvent interfacing with each of multiple position determination technologies.
  • Preferably location information is defined in the presence-based GEOPRIV location object format, which describes an object format for carrying geographical information on the Internet. This location object extends the presence information data format (PIDF), which was designed for communicating privacy-sensitive presence information and which has similar properties. The presence information data format location object (PIDF-LO) specification provides a flexible and versatile means to represent location information.
  • FIG. 1A depicts the insertion of an LO Proxy to separate functions of determining location from the function of gathering information based on determined location, in accordance with the principles of the present invention.
  • In particular, as shown in FIG. 1A, a location object (LO) proxy 100 and location generator 104 is inserted in a path between an incoming SIP message including a unique query key (e.g., a telephone number or uniform resource identifier (URI)) and a positioning center 150.
  • In accordance with the invention, location is queried by the location generator 104 instead of being a required function of the positioning center 150. In this way, the function of determination of location (handled by the location object (LO) proxy 100 and location generator 104) is separated from the function of gathering desired information to be used based on the determined location (e.g., routing instructions for 9-1-1 alls determined based on the determined location), handled by the positioning center 150.
  • The location object (LO) proxy 100 attaches the location object (LO) to the request, and forwards the same to an appropriate positioning center 150 (e.g., a VoIP processing center (VPC)).
  • The disclosed embodiments provide that as new location determination systems or services are defined, only an appropriate location object (LO) proxy 100 need be implemented to receive and query those systems or services based on a unique set of information delivered specific to that location determination technology. The location information system (LIS) as described above is one of those systems. In the LIS example, the LO proxy 100 receives a query key that is used by the LO proxy 100 to query a pre-provisioned database for the latitude and longitude of the provisioned address.
  • Other location services and systems can be implemented in the same manner where the data and structure of the data varies as appropriate for the LO proxy 100 to interface with the service or system delivering location information.
  • FIG. 1B shows an exemplary embodiment of a location proxy architecture including a location proxy broker, which provides determination of a correct LO proxy for a given received SIP message, to handle emergency services requests, in accordance with the principles of the present invention.
  • In particular, as shown in the embodiment of FIG. 1B, a location object (LO) proxy broker (LOPB) 102 is inserted between the incoming SIP messages and the LO proxy 100.
  • As shown in FIG. 1B, two major components are provided to separate location based services (LBS) functions of determining location, and gathering information relating to the determined location: a location object proxy broker (LOPB) 102, and a location object proxy 100 (with location generator 104).
  • The location object proxy broker (LOPB) 102 determines the appropriate LO proxy 100 to use (only one LO proxy is shown in FIG. 1B).
  • The LO proxy 100 attaches a location object to the request (i.e., SIP with location key) and forwards the same to an engine (e.g., positioning center 150) that uses location to determine and return additional information (like routing information for a 911 call, routing information for commercial applications, etc).
  • The disclosed embodiments further provide that as new location determination systems or services are defined, data elements and the structure of that data in the initial SIP INVITE can be defined to query those systems or services for location information. To this end, a location object (LO) proxy broker 102 is implemented in front of the LO proxy (or proxies) 100.
  • The LO proxy broker 102 comprises logic (software and/or hardware) that enables it to evaluate the data elements and structure sent in the initial SIP INVITE to determine the appropriate LO Proxy 100 to send the INVITE to.
  • The Location Object (LO) proxy broker 102 acts like a router for a set of LO proxies 100, where the data included in the messaging indicates to which LO proxy 100 the SIP INVITE should be sent.
  • In operation, a User Endpoint (UE) initiates a SIP INVITE message including a unique location key (and/or other specific set of information in a predetermined location) in the SIP INVITE.
  • The INVITE is sent to the location object proxy broker (LOPB) 102 where the LOPB 102 evaluates key elements to determine which LO proxy 100 supports the technology to determine the location.
  • After the correct LO proxy 100 is determined, the LOPB 102 forwards the INVITE.
  • The LO proxy 100 receives the SIP INVITE from the LOPB 102 and uses key elements in the SIP INVITE to query a database, e.g., location database 504, or service to determine location.
  • Upon receipt of the location, the LO proxy 100 rewrites the SIP INVITE to include location.
  • The LO proxy 100 then forwards the SIP INVITE through the SIP network, presumably to an entity that will make use of the location.
  • For example, let's take a user endpoint (UE) that is a Voice Over IP (VoIP) phone, a pre-provisioned address in a database (e.g., a location information system), and a user that dials 911 (or other designated emergency call number) on the VoIP phone.
  • The SIP INVITE from the VoIP phone will contain a unique key (the URI for example) that is forwarded on to the LOPB 102. The LOPB 102 evaluates the SIP message with the unique key (the caller URI for example) and determines that the SIP INVITE should be routed to the LO proxy (e.g., LO proxy 100) that handles location information system (LIS) requests using a URI.
  • The LOPB 102 sends the SIP INVITE on to the location information system (LIS) LO proxy 100. The location information system (LIS) LO proxy 100 is a specific implementation of the LO proxy able to handle requests for LIS queries.
  • The LIS LO proxy 100 queries the LIS and receives location information back.
  • Once received, the SIP INVITE is rewritten with the location in a PIDF-LO in the SIP message, and is then forwarded on to a PDIF-LO enabled VoIP processing center (VPC) (e.g., positioning center 150) for determination of the appropriate emergency call center (e.g., appropriate Public Safety Access Point (PSAP) that the emergency call should be routed to.
  • FIG. 2 shows that after the location is added to the SIP message, any positioning center may be chosen to send the SIP Invite to.
  • In particular, as shown in FIG. 2, the SIP message with location object included may be forwarded to any (or all) of a plurality of appropriate positioning centers 150 a, 150 b.
  • FIG. 3 shows an exemplary VoIP based commercial architecture including location determination and the use of that location by an application program, in accordance with the principles of another embodiment of the invention.
  • In particular, as shown in FIG. 3, instead of the positioning center(s) 150 shown in FIGS. 1 and 2, the entity that handles the newly-separated secondary function of gathering information based on determined location is an application program 302, including an associated application proxy 300.
  • The application program 302 may be any desired application that utilizes location information received from the LO proxy 100, e.g., in a SIP with location object (LO) message.
  • FIG. 4 shows that after the location is added to the SIP message, the signaling may touch a number of applications depending on the initial requested service. For instance, as depicted in FIG. 4, any number of application programs 302 a-302 c (with associated application proxies 300 a-300 c) may receive the SIP with LO message packaged by the LO proxy 100, in accordance with the principles of the present invention.
  • Thus, as is described in detailed embodiments herein, a location object proxy broker 102 in accordance with the principles of the invention separates location determination from instructions for call processing once location is determined. Also, the present invention enables a common presentation of location in SIP messaging for a location driven engine, examples being a VoIP Positioning Center (VPC) 150 or an application program 302.
  • Those that may make particular use of the invention include any/all communications users, including voice over IP (VoIP), wireless and/or landline users, as well as VoIP service providers.
  • While the invention has been described with reference to the exemplary embodiments thereof, those skilled in the art will be able to make various modifications to the described embodiments of the invention without departing from the true spirit and scope of the invention.

Claims (10)

1. A method for separating determination of location from gathering information based on determined location, comprising:
receiving an incoming Session Internet Protocol (SIP) message at a location object proxy;
determining location of an initiator of said SIP message;
injecting a location object into said SIP message; and
passing said SIP message with location object (LO) to a positioning center.
2. The method for separating determination of location from gathering information based on determined location according to claim 1, wherein said determining location comprises:
querying a database with a unique location key; and
receiving in response a location of an initiator of said SIP message.
3. The method for separating determination of location from gathering information based on determined location according to claim 2, wherein said database comprises:
a static location database.
4. The method for separating determination of location from gathering information based on determined location according to claim 2, wherein said unique location key comprises:
a telephone number.
5. The method for separating determination of location from gathering information based on determined location according to claim 2, wherein said unique location key comprises:
a uniform resource identifier (URI).
6. Apparatus to separate determination of location from gathering information based on determined location, comprising:
means for receiving an incoming Session Internet Protocol (SIP) message at a location object proxy;
means for determining location of an initiator of said SIP message;
means for injecting a location object into said SIP message; and
means for passing said SIP message with location object (LO) to a positioning center.
7. The apparatus to separate determination of location from gathering information based on determined location according to claim 6, wherein said means for determining location comprises:
means for querying a database with a unique location key; and
means for receiving in response a location of an initiator of said SIP message.
8. The apparatus to separate determination of location from gathering information based on determined location according to claim 7, wherein said database comprises:
a static location database.
9. The apparatus to separate determination of location from gathering information based on determined location according to claim 7, wherein said unique location key comprises:
a telephone number.
10. The apparatus to separate determination of location from gathering information based on determined location according to claim 7, wherein said unique location key comprises:
a uniform resource identifier (URI).
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